#include "usart2.h"


void uart2_init(u32 bound) {
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);	//使能USART1，GPIOA时钟

    //USART2_TX   GPIOA.9       RX P5
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA2
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出
    GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA2

    //USART2_RX	  GPIOA.10初始化   TX  P4
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
    GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA3

    //Usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		//子优先级3
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//IRQ通道使能
    NVIC_Init(&NVIC_InitStructure);	//根据指定的参数初始化VIC寄存器

    //USART 初始化设置

    USART_InitStructure.USART_BaudRate = bound;//串口波特率
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
    USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
    USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//收发模式

    USART_Init(USART2, &USART_InitStructure); //初始化串口1
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启串口接受中断
    USART_Cmd(USART2, ENABLE);                    //使能串口1
}

void USART2_IRQHandler(void)                	//串口1中断服务程序
{
    uint8_t ReceiveData;
    if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)
    {
        ReceiveData=USART_ReceiveData(USART2);
        //USART_SendData(USART2,ReceiveData);
        if(ReceiveData==49)
        {
            MY_GPIO_Init(GPIOC,GPIO_Pin_13,GPIO_Mode_Out_PP);
        }
        USART_ClearITPendingBit(USART2, USART_IT_RXNE);
    }
}



